Outwardly, Sudo is a delivery man, but at night he is a "courier" for the underworld.
By chance, he gets together with his neighbor Uno, whom he has been interested in, over a potluck.
The next day, he sleeps with Uno, who is drunk, and the next day, Uno becomes very distant from him.
While he is worried that he might be onto his ulterior motives, he sees Uno being tangled up with some unscrupulous men on the street, and he reflexively takes Uno by the hand and runs away.
The dying Sudo, under attack from the enemy, is saved by a contract with Uno, a descendant of witches.
Sudo learns that Uno has been living in hiding from the world because he is a witch.
To escape his pursuers, Sudo returns to his home to retrieve money for his escape, only to find his pursuers waiting for him...?